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Reservoir-forming Conditions Of Kongdian Formation At South Slope In DongYing Depression

Posted on:2009-04-15Degree:MasterType:Thesis
Country:ChinaCandidate:Y L GaiFull Text:PDF
GTID:2120360245999705Subject:Geological Engineering
Abstract/Summary:PDF Full Text Request
Dongying south slope is the most typical composite hydrocarbon accumulation area of Dongying concave. Up till now, 11 oil-bearing units have been found, commercial oil and gas flow was got in 9 layers and proven reserves were announced for 7 layers. Unequal distribution exists in proven reserves. The reserves are mainly distributed in Shahejie formation, Dongying formation and Guantao formation, but degree of exploration is rather low in Kongdian formation. The key reason is the shortage of systematic study and research on structural properties, depositional system and hydrocarbon lithogenic conditions.The subject of the project is to ascertain the controlling factors of hydrocarbon lithogeny of Kongdian formation, establish complete and systematic hydrocarbon lithogeny mode, ascertain deployment plan of major areas and propose specific exploration targets according to geological research.According to large amount of data from drilling, logging, 3D seismics and analytical tests, by combination of applying continental oil and gas bearing basin sedimentology, modern petroleum geology, organic geochemistry and sequence stratigraphy, structural evolution properties, sedimentation reservoir distribution, hydrocarbon origination and controlling factors of hydrocarbon lithogeny are studied in this project. Favorable places for exploration prospecting and targets are confirmed based on the previous research.By combining geological multidisciplinary analysis, physics of the Earth and laboratory analysis and systematically studying on structure sequence and regional structural evolution, structural patter and evolution properties of Kongdian formation in Dongying concave are analyzed. High frequency sequence stratigraphy is studied, which helps stratigraphic sequence classification and establishment of sequence stratigraphy framework. Stratigraphic sequence classification plan of Sha 4 and Candona formation is confirmed, thus realize isochronic comparison of layers in Candona formation. Hydrocarbon origination and hydrocarbon-generating potential is ascertained by applying new geochemistry technology. From the view of studying hydrocarbon mother rock and conducting system, hydrocarbon lithogeny mode of Candona formation is established and the major controlling factors of major blocks are studied.In this research, the fact is confirmed that structure and sedimentation evolution of Kongdian formation in south slope of Dongying concave is controlled by north-west bounding fault. Problem that lower sub-section of Sha 4 formation and Candona formation are not classified clearly is solved. After large amount of geochemical analysis, oil in Candona formation is different from oil in hydrocarbon mother rock of Shahejie formation in 8 properties, of which original source material, high maturity and microbial structure are the causes of forming high wax content oil. It shows that oil in Candona formation mainly origins from hydrocarbon mother rock of the second section of Candona formation. Hydrocarbon lithogeny mode in Dongying concave is established and 7 types of reservoirs are summed up.By this research, hydrocarbon lithogeny mode in Dongying concave is established and deep major hydrocarbon origination and its relationship with hydrocarbon lithogeny are confirmed. Method of evaluating trapped oil in Candona formation is formed from qualitative evaluation to semiquantitative evaluation. Theory support and tachnical storage are provided for hydrocarbon exploration in Kongdian formation in south slope of Dongying concave. Theory bases are also provided for deep exploration in Jiyang depression, which will function for implementation of"Stabilizing the East"strategy.
Keywords/Search Tags:Dongying south slope, Kongdian formation, Reservoir-forming conditions, Exploration targets
PDF Full Text Request
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